This seems like an odd way of “fixing” things, as no matter what get’s done… the community just comes out with a different way to cheese the sentry’s because, and I’ll use capitol letters here to make a point, THE SENTRY IS NOT ABLE TO DEFEND ITSELF PROPERLY.
It wasn’t able to shoot across the map, it’s not able to attack people in the cave to the sides, it’s constantly confused about who it should be attacking, it won’t lead moving characters, it can’t turn fast enough to hit strafers, it gets confused about the “backdooring” (which really is just a way to stop players from noticing you are attacking it, not a problem in itself), and it gets taken out by being blown up from the top room at the end. Now it also gets jump shotted, who would have guessed?
The problem with the sentry’s is not the layout, but it’s ability to defend itself. Change whatever you want, the next cheese will just use the next structure to cheese it.
The core issue here is that one person, who eludes the player characters, can sit in the back near the shard area and just shoot the things feet to death no problem… or sit on the health station and shoot it’s head. No matter what you do to the actual map, the sentry itself is the problem.